formae vs. Pulumi

Pulumi is an infrastructure as code tool primarily adopted by application development teams that prefer defining infrastructure using general-purpose programming languages. It is commonly used in code-first environments where infrastructure is managed through application programming languages. It works well for day 1 provisioning, where infrastructure is created from scratch and managed through a declared codebase. Since Pulumi’s arrival, however, the way infrastructure is built and operated has continued to evolve. Modern environments change continuously on day 2 and beyond, with updates coming from multiple tools, automation, APIs, and clickops. Keeping declared configuration aligned with reality becomes increasingly difficult over time.

Pulumi state vs formae state

Pulumi maintains a state that represents infrastructure based on the declared program. As infrastructure changes over time, both the state and the Pulumi code can diverge from what actually exists. Changes made through other tools, automation, APIs, or clickops are not reflected unless they are manually reconciled, and the program, the state, and the live environment can become disconnected.

formae uses a different state model. It continuously discovers live infrastructure and versions it into an internal state that always reflects reality, regardless of how changes were made. State does not drift because it is updated through continuous observation rather than manual synchronization.

Pulumi workflows vs formae workflows

Pulumi workflows apply infrastructure changes holistically and fit well with GitOps-style workflows, where updates are rolled out by executing the declared program.

formae supports the same GitOps workflows, but does not require every change to be applied all at once. Teams can apply targeted changes with minimal blast radius while still working through code, which lets formae adapt to different workflows and use cases without forcing every change through a single, holistic rollout.

Pulumi drift handling vs formae drift handling

Pulumi treats infrastructure drift as an undesired anomaly and requires manual reconciliation when it happens.

formae treats drift as a normal outcome of infrastructure changes and continuously absorbs it into its internal state.

Pulumi extensibility vs formae extensibility

Pulumi is extended through providers and language SDKs, which are powerful but often complex to build and maintain. Adding support for new systems typically requires deep knowledge of Pulumi’s provider model and ongoing maintenance as APIs evolve.

formae is designed to be extended directly by infrastructure builders. New systems can be added through plugins with a schema-safe interface, without relying on fragile wrappers or vendor roadmaps. This makes extensibility practical for individual engineers and AI agents.

If you want a deeper, capability-by-capability comparison between Pulumi and formae, you can review the full comparison table. It covers detailed differences and edge cases beyond the high-level comparisons above.